I've washed and dried numerous hand quilted quilts - mostly baby quilts.
One was hand pieced (baby/tumbling blocks) and he would drag it around EVERYWHERE. That poor thing got filthy, plus kids are messy... so it got laundered a LOT.
None have popped stitches, weak seams, or anything else wrong with them. The binding on one is starting to show wear (but it's the one he took everywhere)
The weight of a wet quilt hanging to dry is hard on any of them, regardless of hand or machine quilting. If I hang them outside, I always drape them across all of the four clothes lines. That way the weight is distributed. Wet fibers are weak fibers.
OK, there's my 2 cents on the subject... :-)